A device for interfacing to a bidirectional bus line of the I2C type

摘要

A device for interfacing to a bidirectional bus line of the IIC type, comprising: a first pin (IIC_uC) connected to a port of a device adapted to communicate through an IIC bus, and normally kept at a first high logic potential (V_uC High); a second pin (IIC_Bus) connected to an IIC bus, and normally kept at a second high logic potential (V_Bus High), first switching means (Q25) having an output (Q25_e) directly connected to said second pin (IIC_Bus), a control input (Q25_b) connected to said second pin (IIC_Bus) through a first polarization resistor (R42), and a first terminal (Q25_c) connected to a first reference potential (0), and drive means (Q20) connected to the control input (Q25_b) of said first switching means (Q25), adapted to set said first switching means (Q25) to conduction when said first pin (IIC_uC) is set to a low logic level (V_uC Low).